I might try setting up Trip without direct reference to the QMs, and
QMs with two references to Trip:
class Trip(models.Model):
... trip stuff ...
class QM(models.Model):
found_during = models.ForeignKey(Trip, related_name=''found_qms")
killed_during = models.ForeignKey(Trip, null=True, blank=True,
related_name="killed_qms")
... trip stuff ...
and maybe a few convenience methods and properties:
(in Trip):
@property
def live_qms(self): return self.found_qms.filter(killed_during=None)
(in QM:)
@property
def status(self): return self.killed_during == None and "Live" or
"Dead"
-Jim
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